Answer
$8.5m$
Work Step by Step
As we know that
$\frac{1}{f}=\frac{1}{d_{\circ}}(1-\frac{h_{\circ}}{h_i})$
This can be rearranged as:
$d_{\circ}=f(1-\frac{h_{\circ}}{h_i})$
We plug in the known values to obtain:
$d_{\circ}=0.150(1-\frac{2.0}{-0.036})=8.5m$